Year Number 1996 63.2978706359863 1998 63.2978706359863 2000 70.3703689575195 2002 65.6084671020508 2003 65.8291473388672 2004 74.271842956543 2005 66.019416809082 2006 62.8019332885742 2007 66.1835784912109 2008 69.2307662963867 2009 82.4644546508789 2010 75.8293838500977 2011 68.2464447021484 2012 63.0331764221191 2013 67.7725143432617 2014 77.6190490722656 2015 76.1904754638672 2016 72.3809509277344 2017 73.8095245361328 2018 76.8867950439453 2019 70.7547149658203 2020 72.6415100097656 2021 71.698112487793 2022 76.4150924682617